exhaust manifold heater flap (thermo spiral) - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 09-01-2010, 05:33 PM Thread Starter
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exhaust manifold heater flap (thermo spiral)

1958 220S sedan

Got the two new thermo spirals installed, following the MBZponton page, and the workshop manual instructions. Was careful to put the spirals on in the correct direction shown in the instructions, and to add some tension as instructed.

Engine cold, the flaps are open inside the manifold, allowing warm air to heat up the intake manifold. Weights are rotated out toward the fender, and "at rest". Normal.

Took the car for a nice long drive; engine fully warmed up. Opened the hood, and found the flaps *still* in the open (cold) position. Flap weights still down (flap open), rotated out toward fender. Goosed the throttle a couple times to increase manifold pressure, but no change in the flap weights.

They're completely free to turn with hand pressure against the spiral tension, but the spirals actually seem to hold them open, and not allow them to close for normal warm operation. When the spirals heat up, they get tighter (more tension).

Any suggestions? Seems the spiral should just barely hold the flap open, then tighten under heat and allow the flap to close. But to do that, you have to install the spiral opposite to the workshop manual instructions.

Thanks.
Tom M.
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post #2 of 4 (permalink) Old 09-01-2010, 06:54 PM
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Date registered: May 2007
Vehicle: 64' 220SEc, 72' 300SEL 6.3, lots of parts
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Supposed to be closed when cold, open when warm, as on the 1965 1500cc VW, 1960 220Sb motor, 426 Chrysler Hemi 1967.

The VW would Ice/frost below the throttle plate and stall the motor.

Those are to direct heat into the manifold/base of the carbs for proper fuel vaporization.
The vacuum from the pistons pull and a small throttle opening actually cools the fuel mixture, resulting in fuel condensing and wetting the manifold walls.

gas theory
Gas - Wikipedia, the free encyclopedia

The solution --- fuel injection = better atomization

Brian O
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post #3 of 4 (permalink) Old 09-01-2010, 07:08 PM Thread Starter
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Well, actually the flaps are supposed to be open when the engine is cold. Inside the manifold, the "open" flap directs warm air to the intake manifold. The flap is supposed to close when the engine is warm, so the exhaust goes out through the tailpipe. Take a look:

Mercedes-Benz Ponton Exhaust Manifold Heat Risers © www.mbzponton.org

Mine stay in the same position, whether the engine is cold or warm. Even tho' the flaps are free to rotate against the spring when I push with my hand.

Puzzling.
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post #4 of 4 (permalink) Old 09-02-2010, 01:10 PM
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OK then, I'll believe it, and stick with F.I.

Brian O
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